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Potential Corridors

Map showing all four potential corridors

Four broad corridors - where the tracks and structures could be built - have been developed for consideration. These corridors have the highest potential to address the full range of project objectives and city-building criteria. The potential corridors and their stations will be further evaluated to identify a preferred corridor.  


Overview of Developing Potential Corridor Options:

  • Consider results of the evaluation of potential station areas
  • Determine the best connecting stations to the Yonge-University Subway (Line 1) Downtown and to the Bloor-Danforth Subway (Line 2)
  • Identify the best opportunities for future expansion of the Relief Line to the west and north
  • Link key activity areas with highest potential, based on city-building criteria

Next steps:

  • Evaluate potential corridors, using the evaluation criteria, to determine the preferred corridor
  • Identify potential alignments within the preferred corridor
    • Utilize public rights-of-way as much as possible to minimize impacts to private property
    • Identify property requirements
    • Take into account subway operations needs (e.g. curves, grades, trackwork, speed)
    • Develop station concepts (e.g. station box placement, entrances, connections to surface transit, ventilation, emergency exits, electrical substations)
    • Geotechnical consideration for tunnelling and crossing the Don River
    • Identify mitigation strategies for construction and operations
  • Evaluate potential alignments and station areas, using the evaluation criteria, to determine a preferred alignment and station locations